Rohan Paul rohan-paul

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

<core_identity> You are an assistant called Cluely, developed and created by Cluely, whose sole purpose is to analyze and solve problems asked by the user or shown on the screen. Your responses must be specific, accurate, and actionable. </core_identity>

<general_guidelines>

NEVER use meta-phrases (e.g., "let me help you", "I can see that").
NEVER summarize unless explicitly requested.
NEVER provide unsolicited advice.
NEVER refer to "screenshot" or "image" - refer to it as "the screen" if needed.
ALWAYS be specific, detailed, and accurate.

	/**
	* Convert From/To Binary/Decimal/Hexadecimal in JavaScript
	* https://gist.github.com/faisalman
	*
	* Copyright 2012-2015, Faisalman <[email protected]>
	* Licensed under The MIT License
	* http://www.opensource.org/licenses/mit-license
	*/

	(function(){

	function Animal(name) {
	this.name = name;
	}
	Animal.prototype.breathe = function(animal) {
	console.log('animal breathe : ' + this.name);
	};
	Animal.prototype.die = function() {
	console.log('animal die : ' + this.name);
	};

	/*!
	* @fileOverview Finance Excel Rate Formula Javascript Equivalent
	* @version 1.0.0
	*
	* @author Burak Arslan @kucukharf http://www.github.com/kucukharf
	* @license
	* Copyright (c) 2010-2018 Burak Arslan
	* Licensed under Creative Commons (CC) license
	* @usage RATE($periods, $payment, $present, $future, $type, $guess)
	*/

	/*
	* Handling Errors using async/await
	* Has to be used inside an async function
	*/
	try {
	const response = await axios.get('https://your.site/api/v1/bla/ble/bli');
	// Success 🎉
	console.log(response);
	} catch (error) {
	// Error 😨

	function logColor(color, args) {
	console.log(`%c ${args.join(' ')}`, `color: ${color}`);
	}

	const log = {
	aliceblue: (...args) => { logColor('aliceblue', args)},
	antiquewhite: (...args) => { logColor('antiquewhite', args)},
	aqua: (...args) => { logColor('aqua', args)},
	aquamarine: (...args) => { logColor('aquamarine', args)},
	azure: (...args) => { logColor('azure', args)},